Intersonic crack propagation in bimaterial systems

Citation
Aj. Rosakis et al., Intersonic crack propagation in bimaterial systems, J MECH PHYS, 46(10), 1998, pp. 1789-1813
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
ISSN journal
0022-5096 → ACNP
Volume
46
Issue
10
Year of publication
1998
Pages
1789 - 1813
Database
ISI
SICI code
0022-5096(199810)46:10<1789:ICPIBS>2.0.ZU;2-P
Abstract
This paper describes experimental observations of various phenomena charact eristic of dynamic intersonic decohesion of bimaterial interfaces. Two sepa rate but complementary optical methods are used in conjunction with high-sp eed photography to explore the nature of the large-scale contact and mach w ave formation at the vicinity of running cracks in two different bimaterial systems. Theoretical predictions of crack tip speed regimes, where large-s cale contact is implied, are confirmed. Also, the theoretically predicted m ach wave emanating from the intersonically propagating crack tip is observe d. Direct visual evidence is also obtained for another traveling mach wave emanating from the end of the intersonically moving contact zone. Subsequen tly, a physical model for intersonic crack propagation along bimaterial int erfaces is presented and ratified in view of recent experimental observatio ns and theoretical developments. Finally, the paper presents very recent ex perimental evidence that shows crack tip speeds exceeding the intersonic re gime and becoming clearly supersonic. (C) 1998 Elsevier Science Ltd. All ri ghts reserved.